6727 lofiadm: remove "o:" from getopt argument
Reviewed by: Robert Mustacchi <rm@joyent.com>

@@ -23,10 +23,11 @@
  * Use is subject to license terms.
  * Copyright 2012 Joyent, Inc.  All rights reserved.
  *
  * Copyright 2013 Nexenta Systems, Inc. All rights reserved.
  * Copyright (c) 2014 Gary Mills
+ * Copyright (c) 2016 Andrey Sokolov
  */
 
 /*
  * lofiadm - administer lofi(7d). Very simple, add and remove file<->device
  * associations, and display status. All the ioctls are private between

@@ -1830,11 +1831,11 @@
         pname = getpname(argv[0]);
 
         (void) setlocale(LC_ALL, "");
         (void) textdomain(TEXT_DOMAIN);
 
-        while ((c = getopt(argc, argv, "a:c:Cd:efk:o:rs:T:U")) != EOF) {
+        while ((c = getopt(argc, argv, "a:c:Cd:efk:rs:T:U")) != EOF) {
                 switch (c) {
                 case 'a':
                         addflag = B_TRUE;
                         if ((filename = realpath(optarg, realfilename)) == NULL)
                                 die("%s", optarg);